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- W2016719410 abstract "The mechanism of highly selective etching by a pulsed-microwave electron-cyclotron-resonance plasma was investigated by analyzing surface-reaction layers formed on nonpatterned poly-Si and SiO 2 samples and gate-patterned samples with a gate width of 32 nm. The samples were etched by using an HBr/O 2 /Ar/CH 4 gas chemistry and varying the duty cycle of the pulsed microwave. The reaction layers, which were revealed as a hydrocarbon layer on a SiBr x O y layer, were analyzed by X-ray photoelectron spectroscopy. The upper layer was a hydrocarbon layer, which protected SiO 2 from ion bombardment and also prevented Br flux from being supplied to the SiO 2 . The lower layer was a SiBr x O y layer, which suppressed the etching of the underlying Si substrate. The formation of the hydrocarbon layer was controlled by the duty cycle of the microwave plasma. Etch stop, which occurred at a low peak-to-peak voltage (wafer bias) of the continuous microwave plasma, was prevented by controlling the thickness of the hydrocarbon layer in the pulsed-microwave plasma. Gate-oxide punch-through, which occurred at a high peak-to-peak voltage of wafer bias in the case of the continuous microwave plasma, was also prevented in the case of the pulsed microwave plasma by forming reaction layers with high C/Br ratio." @default.
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- W2016719410 date "2014-03-01" @default.
- W2016719410 modified "2023-10-16" @default.
- W2016719410 title "Surface analysis of polysilicon gate etching by pulsed-microwave plasma" @default.
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- W2016719410 doi "https://doi.org/10.7567/jjap.53.03dd04" @default.
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